How did we learn to read hieroglyphics

We learned how to read ancient hieroglyphics when after Napoleon's troops discovered the Rosetta Stone, which had translations of the hieroglyphics in Ancient Greek, which many people knew how to read. 

Britain and its empire stood alone against hitler and mussolini. in june 1941, hitler broke the non-aggression agreement with stalin and germany invaded the soviet union. in december, japan attacked the us and britain. the main lines of world war ii had formed.